bigops-external-auth@35.1.6

Analysis

bigops-external-auth@35.1.6 is a trojanized authentication module that downloads and executes a platform-specific binary payload at install time. When required, the package's _adapter.js detects the operating system and architecture, then fetches a binary from attacker-controlled Cloudflare Workers endpoints (oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev, oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf102-baf[.]workers[.]dev) via HTTPS GET to /pkg/package (or platform-specific paths). If the Cloudflare endpoints fail, it falls back to DNS TXT record resolution through c[.]sdk[.]dl[.]wel1[.]ru to retrieve the payload. The downloaded binary is written to /var/tmp/.cache_<random-hex> on Linux/macOS or %TEMP%\dotnet_diag_<hex>.exe on Windows, made executable, and spawned as a detached background process that outlives the parent.